View Source ssl_crl_cache_api behaviour (ssl v11.2)

API for a TLS CRL (Certificate Revocation List) cache.

When TLS performs certificate path validation according to RFC 5280 it should also perform CRL validation checks. To enable the CRL checks the application needs access to CRLs. A database of CRLs can be set up in many different ways. This module provides the behavior of the API needed to integrate an arbitrary CRL cache with the erlang ssl application. It is also used by the application itself to provide a simple default implementation of a CRL cache.

Summary

Types

Reference to the CRL cache.

Information for ssl applications use of Logger(3)

Callbacks

fun fresh_crl/2 will be used as input option update_crl to public_key:pkix_crls_validate/3.

Backwards compatibility, replaced by lookup/3

Lookup the CRLs belonging to the distribution point Distributionpoint. This function may choose to only look in the cache or to follow distribution point links depending on how the cache is administrated.

Select the CRLs in the cache that are issued by Issuer unless the value is a list of so called general names, see X509 certificates records, originating form #'DistributionPoint'.cRLissuer and representing different mechanism to obtain the CRLs. The cache callback needs to use the appropriate entry to retrieve the CRLs or return an empty list if it does not exist.

Types

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crl_cache_ref()

View Source (since OTP 18.0)
-type crl_cache_ref() :: any().

Reference to the CRL cache.

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dist_point()

View Source (since OTP 18.0)
-type dist_point() ::
    #'DistributionPoint'{distributionPoint :: term(), reasons :: term(), cRLIssuer :: term()}.

For description see X509 certificates records

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logger_info()

View Source (since OTP 18.0)
-type logger_info() ::
    {logger:level(), Report :: #{description => string(), reason => term()}, logger:metadata()}.

Information for ssl applications use of Logger(3)

Callbacks

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fresh_crl(DistPoint, CRL)

View Source (since OTP 18)
-callback fresh_crl(DistPoint :: dist_point(), CRL :: public_key:der_encoded()) ->
             public_key:der_encoded() | {logger, logger_info(), public_key:der_encoded()}.

fun fresh_crl/2 will be used as input option update_crl to public_key:pkix_crls_validate/3.

It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.

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lookup(DistPoint, CacheRef)

View Source (optional) (since OTP 18)
-callback lookup(DistPoint :: dist_point(), CacheRef :: crl_cache_ref()) ->
          not_available |
          [public_key:der_encoded()] |
          {{logger, logger_info()}, [public_key:der_encoded()]}.

Backwards compatibility, replaced by lookup/3

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lookup(Distpoint, Issuer, CacheRef)

View Source (since OTP 19.0)
-callback lookup(Distpoint :: dist_point(), Issuer :: public_key:issuer_name(), CacheRef :: crl_cache_ref()) ->
          not_available |
          [public_key:der_encoded()] |
          {{logger, logger_info()}, [public_key:der_encoded()]}.

Lookup the CRLs belonging to the distribution point Distributionpoint. This function may choose to only look in the cache or to follow distribution point links depending on how the cache is administrated.

The Issuer argument contains the issuer name of the certificate to be checked. Normally the returned CRL should be issued by this issuer, except if the cRLIssuer field of DistributionPoint has a value, in which case that value should be used instead.

In an earlier version of this API, the lookup function received two arguments, omitting Issuer. For compatibility, this is still supported: if there is no lookup/3 function in the callback module,lookup/2 is called instead.

It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.

Link to this callback

select(IssuerOrDPLocations, CacheRef)

View Source (since OTP 18)
-callback select(IssuerOrDPLocations, CacheRef) -> [CRL] | {logger, logger_info(), [CRL]}
          when
              CRL :: public_key:der_encoded(),
              IssuerOrDPLocations :: public_key:issuer_name() | list(),
              CacheRef :: crl_cache_ref().

Select the CRLs in the cache that are issued by Issuer unless the value is a list of so called general names, see X509 certificates records, originating form #'DistributionPoint'.cRLissuer and representing different mechanism to obtain the CRLs. The cache callback needs to use the appropriate entry to retrieve the CRLs or return an empty list if it does not exist.

It is possible to return logger info, since OTP 22.2, that will be used by the TLS connection to produce log events.